| 释义 |
parathermic, a.|pærəˈθɜːmɪk|
[f. Gr. παρα- para-1 1 + θερµός warm, hot + -ic.]
Name given by Sir J. Herschel to invisible rays accompanying the orange and red rays in the spectrum, and having the quality of discharging the colour from paper tinted with certain vegetable juices: so called in reference to the neighbouring thermic or heat rays.
1843Sir J. Herschel in Phil. Trans. I. 5 Certain rays, which..accompany in the spectrum the red and orange rays, and are also copiously emitted by heated bodies short of redness..I would propose the term parathermic rays to designate them. 1849M. Somerville Connex. Phys. Sc. xxiv. (1858) 217 A new set of obscure rays in the solar spectrum, which seem to bear the same relation to those of heat that the photographic or chemical rays bear to the luminous. |